Adapter plug



FIG. 1 is a perspective view of the front, left and of the adapter plug;

FIG. 2 is a front elevational view of the adapter plug;

FIG. 3 is a bottom plan view of the adapter plug;

FIG. 4 is a top plan view of the adapter plug;

FIG. 5 is a rear elevational view of the adapter plug;

FIG. 6 is a left side elevational view of the adapter plug; and,

FIG. 7 is a right side elevational view of the adapter plug. 

The ornamental design for an adapter plug, as shown. 